<!doctype html>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1167519
-->
<head>
  <meta charset=utf-8>
  <script type="application/javascript"
    src="/tests/SimpleTest/paint_listener.js"></script>
  <style>
    #target {
      height: 100px;
      width: 100px;
      background: green;
      transition: transform 100s linear;
    }
  </style>
</head>
<body>
<div id="target"></div>
<script>
'use strict';

var ok = opener.ok.bind(opener);
var isnot = opener.isnot.bind(opener);

function finish() {
  var o = opener;
  self.close();
  o.SimpleTest.finish();
}

var OMTAPrefKey = "layers.offmainthreadcomposition.async-animations";
var omtaEnabled = SpecialPowers.DOMWindowUtils.layerManagerRemote &&
                  opener.SpecialPowers.getBoolPref(OMTAPrefKey);
window.addEventListener("load", function() {
  if (!omtaEnabled) {
    ok(true, "Skipping the test since OMTA is disabled");
    finish();
    return;
  }

  var div = document.getElementById("target");
  // Start first transition
  div.style.transform = "translateX(300px)";
  getComputedStyle(div);

  // Wait for a paint to ensure that the first transition has started.
  waitForAllPaints(function() {
    var previousPropertyValue;
    var previousKeyframeValue;
    var anim;
    requestAnimationFrame(function() {
      // Start second transition
      div.style.transform = "translateX(0px)";
      getComputedStyle(div).transform;

      anim = div.getAnimations()[0];
      var properties = SpecialPowers.wrap(anim.effect).getProperties();
      previousPropertyValue = properties[0].values[0].value;
      previousKeyframeValue = anim.effect.getKeyframes()[0].transform;
    });

    requestAnimationFrame(function() {
      // Tie up main thread for 300ms. In the meantime, the first transition
      // will continue running on the compositor. If we don't update the start
      // point of the second transition, it will appear to jump when it starts.
      var startTime = performance.now();
      while (performance.now() - startTime < 300);

      // Ensure that our paint process has been done.
      // Note that requestAnimationFrame is not suitable here since on Android
      // there is a case where the paint process has not completed even when the
      // requestAnimationFrame callback is run (and it is during the paint
      // process that we update the transition start point).
      waitForAllPaints(function() {
        var properties = SpecialPowers.wrap(anim.effect).getProperties();
        var currentPropertyValue = properties[0].values[0].value;
        isnot(currentPropertyValue, previousPropertyValue,
              "From value of transition is updated since the moment when " +
              "it was generated");
        isnot(anim.effect.getKeyframes()[0].transform, previousKeyframeValue,
              "Keyframe value of transition is updated since the moment when " +
              "it was generated");
        finish();
      });
    });
  });
});

</script>
</body>
</html>
